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Antioxidant Activities and Characterization of Polyphenols from Selected Northern Thai Rice Husks: Relation with seed Attributes

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Rice science 2023年第2期30卷 148-159,I0039页

作者： Jiratchaya WISETKOMOLMAT Chaiwat ARJIN Surat HONGSIBSONG Warintorn RUKSIRIWANICH Chutamat NIWAT Pimsiri TIYAYON Sansanee JAMJOD Supapohn YAMUANGMORN Chanakan PROM-U-THAI Korawan SRINGARM Department of Animal and Aquatic Sciences Faculty of AgricultureChiang Mai UniversityChiang Mai 50200Thailand School of Health Science Research Research Institute for Health SciencesChiang Mai UniversityChiang Mai 50200Thailand Department of Pharmaceutical Sciences Faculty of PharmacyChiang Mai UniversityChiang Mai 50200Thailand Food Science and Technology Program School of Agro-IndustryMae Fah Luang UniversityChiang Rai 57100Thailand School of Agricultural Resources Chulalongkorn UniversityBangkok 10330Thailand Agronomy Division Department of Plant and Soil SciencesFaculty of AgricultureChiang Mai UniversityChiang Mai 50200Thailand Lanna Rice Research Center Chiang Mai UniversityChiang Mai 50200Thailand Cluster of Research and Development of Pharmaceutical and Natural Products Innovation for Human or Animal Chiang Mai UniversityChiang Mai 50200Thailand

Rice production generates a significant amount of agricultural waste. This study aimed to give results related to the existence of antioxidant phenols in agricultural waste of selected Northern Thai rice varieties. The antioxidant activities, contents of total flavonoids and phenolic compounds in the ethanolic rice husk extract were evaluated. The highest antioxidant activities were found in the variety PES1CMU, with 2,2’-azinobis-3-ethyl-benzothiazoline-6-sulfonic acid and 2,2-diphenyl-1-picrylhydrazyl as 679.66 and 4.16 mmol/(L·g) trolox equivalent, respectively, ferric reducing antioxidant power as 0.87 mmol/(L·g) Fe2+, total phenolic content as 29.90 mmol/(L·g) gallic acid and total flavonoid content as 12.16 mg/g catechin equivalent. Polyphenol compounds were identified mainly by standard polyphenols using the liquid chromatography mass spectrometry, with the highest contents of phytic acid, o-coumaric acid, naringin and kaempferol. The non-glutenous and wetland ecotypes of rice husk samples were the richest in antioxidant activities and polyphenol contents characterized by using principal component analysis. The glutenous rice husk contained higher antioxidant activities than the rest. Interestingly, quercetin is a significant phenolic compound that positively correlated with the overall antioxidant activities of rice husk. This finding will be relevant for future application of rice husk antioxidant components in the production of functional ingredients as well as for the food and pharmaceutical industries.

关键词： antioxidant agri-waste polyphenol rice husk seed characteristic Thai rice

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Propagation characteristics of Jatropha curcas under Different Climate Conditions in Yunnan,China

Propagation Characteristics of Jatropha curcas under Differe...

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第十四届中国科协年会第6分会场：林业新兴产业科技创新与绿色增长学术研讨会

作者： LUO Changwei 12,LI Kun 12,LIU Fangyan 12,SUN Yongyu 12,TANG Guoyong 12 and WANG Xiaoqing 1 (1. Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, China 2. Desert Ecosystem Station in Yuanmou County, State Forestry Administration of China, Yuanmou 651300, China)

Yunnan is rich in wild resources and plantation of Jatropha curcas in China. This paper studied the flowering, fruit setting, pollination, seeds biological characteristics of J. curcas. The results showed that the floral display of J. curcas often show protandry with the complete overlapping of female and male phase. Male flowers often blossom firstly, following by quick opening of female ones. Even after all the female flowers have blossomed totally, some of the male ones are still left un-open. However, the floral display often showed protandry under water stress, while most of the female flowers blossom after most male flowers finish opening. Flower visitors are mainly bees, flies, beetles, ants, butterflies, and bugs. Most of J. curcas plants have two crops, with the first crop the most important commercially. Individual fruits increase with declined planting density, and increasing soil fertilizer content and water regimes. seeds characteristics are different among different producing areas. Correlation analysis showed that correlation between KOC, HGW, HKW and local accumulated temperature below 7000 ℃ is positive. While above 7000 ℃, the correlations is negative. There are no evident correlations between HGW, HKW, and accumulated temperatures.

关键词： agriculture blossom Pollination fruit-setting seed characteristic

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